VIA-942: Enforce Session Expiry Reliably After 10 Minutes of Inactivity

src/app/_components/inactivity/InactivityDialog.test.tsx

@@ -25,6 +25,7 @@ jest.mock("next/navigation", () => ({
   usePathname: jest.fn(() => mockUrlPath),
 }));
 
+jest.mock("sanitize-data", () => ({ sanitize: jest.fn() }));
 jest.mock("@src/utils/auth/inactivity-timer");
 jest.mock("@src/utils/auth/user-logout");
 

src/app/our-policies/cookies-policy/CookiesTable.test.tsx

@@ -18,34 +18,47 @@ describe("CookiesTable component", () => {
     const rowHeader1: HTMLElement = screen.getByRole("rowheader", { name: "__Host-authjs.csrf-token" });
     const rowHeader2: HTMLElement = screen.getByRole("rowheader", { name: "__Secure-authjs.callback-url" });
     const rowHeader3: HTMLElement = screen.getByRole("rowheader", { name: "__Secure-authjs.session-token" });
+    const rowHeader4: HTMLElement = screen.getByRole("rowheader", { name: "__Host-Http-session-id" });
+    const rowHeader5: HTMLElement = screen.getByRole("rowheader", { name: "__Secure-signout" });
 
     expect(rowHeader1).toBeVisible();
     expect(rowHeader2).toBeVisible();
     expect(rowHeader3).toBeVisible();
+    expect(rowHeader4).toBeVisible();
+    expect(rowHeader5).toBeVisible();
   });
 
   it("displays table with correct cell values", () => {
     render(<CookiesTable />);
-    const cell1: HTMLElement = screen.getByRole("cell", {
+
+    const csrfCookieText: HTMLElement = screen.getByRole("cell", {
       name: "Helps keep the site secure by preventing cross-site request forgery (CSRF) attacks",
     });
-    const cell2: HTMLElement = screen.getByRole("cell", {
+    const redirectUrlCookieText: HTMLElement = screen.getByRole("cell", {
       name: "After a successful login, this stores the URL that you are redirected to",
     });
-    const cell3: HTMLElement = screen.getByRole("cell", {
+    const encryptedSessionTokenCookieText: HTMLElement = screen.getByRole("cell", {
       name: "Stores information in an encrypted format that allows us to communicate with other services",
     });
-    const cell4: HTMLElement = screen.getByRole("cell", {
+    const sessionIdCookieText: HTMLElement = screen.getByRole("cell", {
       name: "Stores a unique, randomly generated session ID used in operational logs to help our IT support team investigate issues",
     });
-    const cells5and6: HTMLElement[] = screen.getAllByRole("cell", { name: "When you close the browser" });
-    const cells7and8: HTMLElement[] = screen.getAllByRole("cell", { name: "After 1 hour" });
-
-    expect(cell1).toBeVisible();
-    expect(cell2).toBeVisible();
-    expect(cell3).toBeVisible();
-    expect(cell4).toBeVisible();
-    expect(cells5and6.length).toBe(2);
-    expect(cells7and8.length).toBe(2);
+    const signoutCookieText: HTMLElement = screen.getByRole("cell", {
+      name: "Stores temporary information used to identify when you sign out or are signed out after a period of inactivity.",
+    });
+
+    const onBrowserCloseCookieTime: HTMLElement[] = screen.getAllByRole("cell", { name: "When you close the browser" });
+    const after1hourCookieTime: HTMLElement[] = screen.getAllByRole("cell", { name: "After 1 hour" });
+    const after30sCookieTime: HTMLElement[] = screen.getAllByRole("cell", { name: "After 30 seconds" });
+
+    expect(csrfCookieText).toBeVisible();
+    expect(redirectUrlCookieText).toBeVisible();
+    expect(encryptedSessionTokenCookieText).toBeVisible();
+    expect(sessionIdCookieText).toBeVisible();
+    expect(signoutCookieText).toBeVisible();
+
+    expect(onBrowserCloseCookieTime.length).toBe(2);
+    expect(after1hourCookieTime.length).toBe(2);
+    expect(after30sCookieTime.length).toBe(1);
   });
 });

src/app/our-policies/cookies-policy/CookiesTable.tsx

@@ -54,6 +54,16 @@ const CookiesTable = (): JSX.Element => {
           </td>
           <td className="nhsuk-table__cell nhsuk-table__cell">After 1 hour</td>
         </tr>
+        <tr className="nhsuk-table__row">
+          <th scope="row" className="nhsuk-table__header">
+            __Secure-signout
+          </th>
+          <td className="nhsuk-table__cell nhsuk-table__cell">
+            Stores temporary information used to identify when you sign out or are signed out after a period of
+            inactivity.
+          </td>
+          <td className="nhsuk-table__cell nhsuk-table__cell">After 30 seconds</td>
+        </tr>
       </tbody>
     </table>
   );

src/utils/auth/callbacks/get-token.test.ts

@@ -4,10 +4,14 @@ import { getOrRefreshApimCredentials } from "@src/utils/auth/apim/get-or-refresh
 import { getToken } from "@src/utils/auth/callbacks/get-token";
 import { MaxAgeInSeconds } from "@src/utils/auth/types";
 import config from "@src/utils/config";
+import { SESSION_ID_COOKIE_NAME, SIGNOUT_FLAG_COOKIE_NAME } from "@src/utils/constants";
 import { ConfigMock, configBuilder } from "@test-data/config/builders";
 import { jwtDecode } from "jwt-decode";
 import { Account, Profile } from "next-auth";
 import { JWT } from "next-auth/jwt";
+import { RequestCookie } from "next/dist/compiled/@edge-runtime/cookies";
+import { ReadonlyRequestCookies } from "next/dist/server/web/spec-extension/adapters/request-cookies";
+import { cookies } from "next/headers";
 
 jest.mock("@project/auth", () => ({
   auth: jest.fn(),
@@ -20,6 +24,10 @@ jest.mock("@src/utils/auth/apim/get-or-refresh-apim-credentials", () => ({
 jest.mock("jwt-decode");
 jest.mock("sanitize-data", () => ({ sanitize: jest.fn() }));
 jest.mock("@src/utils/config");
+jest.mock("next/headers", () => ({
+  cookies: jest.fn(),
+  headers: jest.fn(),
+}));
 
 describe("getToken", () => {
   const mockedConfig = config as ConfigMock;
@@ -55,6 +63,16 @@ describe("getToken", () => {
     jest.useFakeTimers().setSystemTime(nowInSeconds * 1000);
     process.env.NEXT_RUNTIME = "nodejs";
 
+    const fakeRequestCookies: ReadonlyRequestCookies = {
+      get(name: string): RequestCookie {
+        return {
+          name: `fake-${name}-name`,
+          value: `fake-${name}-value`,
+        };
+      },
+    } as ReadonlyRequestCookies;
+    (cookies as jest.Mock).mockResolvedValue(fakeRequestCookies);
+
     (jwtDecode as jest.Mock).mockReturnValue({
       jti: "jti_test",
     });
@@ -171,6 +189,41 @@ describe("getToken", () => {
         maxAgeInSeconds,
       );
     });
+
+    it("should not return session if signout cookie value matches current session id", async () => {
+      const mockSessionId = "test-session-id";
+      const fakeRequestCookies: ReadonlyRequestCookies = {
+        get(name: string): RequestCookie | undefined {
+          if (name === SIGNOUT_FLAG_COOKIE_NAME) return { name: SIGNOUT_FLAG_COOKIE_NAME, value: mockSessionId };
+          if (name === SESSION_ID_COOKIE_NAME) return { name: SESSION_ID_COOKIE_NAME, value: mockSessionId };
+          return { name: `fake-${name}-name`, value: `fake-${name}-value` };
+        },
+      } as ReadonlyRequestCookies;
+      (cookies as jest.Mock).mockResolvedValue(fakeRequestCookies);
+
+      const token = { apim: {}, nhs_login: { id_token: "id-token" } } as JWT;
+      const maxAgeInSeconds = 600 as MaxAgeInSeconds;
+
+      const result = await getToken(token, account, profile, maxAgeInSeconds);
+      expect(result).toBeNull();
+    });
+
+    it("should ignore signout cookie if its value does not match current session id", async () => {
+      const fakeRequestCookies: ReadonlyRequestCookies = {
+        get(name: string): RequestCookie | undefined {
+          if (name === SIGNOUT_FLAG_COOKIE_NAME) return { name: SIGNOUT_FLAG_COOKIE_NAME, value: "old-session-id" };
+          if (name === SESSION_ID_COOKIE_NAME) return { name: SESSION_ID_COOKIE_NAME, value: "current-session-id" };
+          return { name: `fake-${name}-name`, value: `fake-${name}-value` };
+        },
+      } as ReadonlyRequestCookies;
+      (cookies as jest.Mock).mockResolvedValue(fakeRequestCookies);
+
+      const token = { apim: {}, nhs_login: { id_token: "id-token" } } as JWT;
+      const maxAgeInSeconds = 600 as MaxAgeInSeconds;
+
+      const result = await getToken(token, account, profile, maxAgeInSeconds);
+      expect(result).not.toBeNull();
+    });
   });
 
   describe("when AUTH APIM is not available", () => {
@@ -196,6 +249,24 @@ describe("getToken", () => {
         maxAgeInSeconds,
       );
     });
+
+    it("should not return session if signout cookie value matches current session id", async () => {
+      const mockSessionId = "test-session-id";
+      const fakeRequestCookies: ReadonlyRequestCookies = {
+        get(name: string): RequestCookie | undefined {
+          if (name === SIGNOUT_FLAG_COOKIE_NAME) return { name: SIGNOUT_FLAG_COOKIE_NAME, value: mockSessionId };
+          if (name === SESSION_ID_COOKIE_NAME) return { name: SESSION_ID_COOKIE_NAME, value: mockSessionId };
+          return { name: `fake-${name}-name`, value: `fake-${name}-value` };
+        },
+      } as ReadonlyRequestCookies;
+      (cookies as jest.Mock).mockResolvedValue(fakeRequestCookies);
+
+      const token = { apim: {}, nhs_login: { id_token: "id-token" } } as JWT;
+      const maxAgeInSeconds = 600 as MaxAgeInSeconds;
+
+      const result = await getToken(token, account, profile, maxAgeInSeconds);
+      expect(result).toBeNull();
+    });
   });
 
   const expectResultToMatchTokenWith = (

src/utils/auth/callbacks/get-token.ts

@@ -4,9 +4,11 @@ import { NhsNumber } from "@src/models/vaccine";
 import { getOrRefreshApimCredentials } from "@src/utils/auth/apim/get-or-refresh-apim-credentials";
 import { ApimAccessCredentials } from "@src/utils/auth/apim/types";
 import { BirthDate, IdToken, MaxAgeInSeconds, NowInSeconds } from "@src/utils/auth/types";
+import { SESSION_ID_COOKIE_NAME, SIGNOUT_FLAG_COOKIE_NAME } from "@src/utils/constants";
 import { logger } from "@src/utils/logger";
 import { Account, Profile } from "next-auth";
 import { JWT } from "next-auth/jwt";
+import { cookies } from "next/headers";
 import { Logger } from "pino";
 
 const log: Logger = logger.child({ module: "utils-auth-callbacks-get-token" });
@@ -24,13 +26,21 @@ const getToken = async (
   profile: Profile | undefined,
   maxAgeInSeconds: MaxAgeInSeconds,
 ) => {
+  const requestCookies = await cookies();
+  const nowInSeconds = Math.floor(Date.now() / 1000);
+
+  const signOutFlagValue = requestCookies?.get(SIGNOUT_FLAG_COOKIE_NAME)?.value;
+  const currentSessionId = requestCookies?.get(SESSION_ID_COOKIE_NAME)?.value;
+  if (signOutFlagValue && currentSessionId && signOutFlagValue === currentSessionId) {
+    log.info("getToken: User has recently been signed out. Returning null");
+    return null;
+  }
+
   if (!token) {
     log.error("getToken: No token available in jwt callback. Returning null");
     return null;
   }
 
-  const nowInSeconds = Math.floor(Date.now() / 1000);
-
   // Maximum age reached scenario: invalidate session after fixedExpiry
   if (token.fixedExpiry && nowInSeconds >= token.fixedExpiry) {
     log.info("getToken: Token has reached fixedExpiry time, or session has reached the max age. Returning null");

src/utils/auth/setSignOutFlagCookie.test.ts

@@ -0,0 +1,46 @@
+import setSignOutFlagCookie from "@src/utils/auth/setSignOutFlagCookie";
+import { SESSION_ID_COOKIE_NAME, SIGNOUT_FLAG_COOKIE_NAME } from "@src/utils/constants";
+
+const mockSessionId = "session-id-123";
+const setCookie = jest.fn();
+jest.mock("sanitize-data", () => ({ sanitize: jest.fn() }));
+jest.mock("@src/utils/config", () => ({
+  __esModule: true,
+  default: {
+    MAX_SESSION_AGE_MINUTES: Promise.resolve(2),
+  },
+}));
+
+jest.mock("next/headers", () => ({
+  cookies: jest.fn(() => ({
+    get: jest.fn((name) => {
+      if (name === SESSION_ID_COOKIE_NAME) {
+        return { value: mockSessionId };
+      }
+      return undefined;
+    }),
+    set: setCookie,
+  })),
+  headers: jest.fn(),
+}));
+
+describe("setSignOutFlagCookie", () => {
+  beforeEach(() => {
+    jest.useFakeTimers().setSystemTime(new Date("2026-01-01T00:00:00.000Z"));
+  });
+
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
+  it("should set signout cookie with the current session id", async () => {
+    await setSignOutFlagCookie();
+    const expectedCookieTimeoutSeconds = 30;
+    expect(setCookie).toHaveBeenCalledWith(SIGNOUT_FLAG_COOKIE_NAME, mockSessionId, {
+      maxAge: expectedCookieTimeoutSeconds,
+      secure: true,
+      httpOnly: true,
+      sameSite: "lax",
+    });
+  });
+});

src/utils/auth/setSignOutFlagCookie.ts

@@ -0,0 +1,23 @@
+"use server";
+
+import { SESSION_ID_COOKIE_NAME, SIGNOUT_FLAG_COOKIE_NAME } from "@src/utils/constants";
+import { requestScopedStorageWrapper } from "@src/utils/requestScopedStorageWrapper";
+import { cookies } from "next/headers";
+
+const setSignOutFlagCookie = async () => {
+  return requestScopedStorageWrapper(setSignOutFlagCookieAction);
+};
+
+const setSignOutFlagCookieAction = async () => {
+  const SIGN_OUT_FLAG_COOKIE_MAX_AGE_SECONDS = 30;
+  const cookieStore = await cookies();
+  const currentSessionId = cookieStore.get(SESSION_ID_COOKIE_NAME)?.value ?? "";
+  cookieStore.set(SIGNOUT_FLAG_COOKIE_NAME, currentSessionId, {
+    secure: true,
+    httpOnly: true,
+    sameSite: "lax",
+    maxAge: SIGN_OUT_FLAG_COOKIE_MAX_AGE_SECONDS,
+  });
+};
+
+export default setSignOutFlagCookie;

src/utils/auth/user-logout.test.ts

@@ -2,10 +2,13 @@ import { SESSION_LOGOUT_ROUTE } from "@src/app/session-logout/constants";
 import { SESSION_TIMEOUT_ROUTE } from "@src/app/session-timeout/constants";
 import { userLogout } from "@src/utils/auth/user-logout";
 import { signOut } from "next-auth/react";
+import setSignOutFlagCookie from "@src/utils/auth/setSignOutFlagCookie";
 
 jest.mock("next-auth/react", () => ({
   signOut: jest.fn(),
 }));
+jest.mock("@src/utils/auth/setSignOutFlagCookie");
+jest.mock("sanitize-data", () => ({ sanitize: jest.fn() }));
 
 describe("user-logout", () => {
   it("should call signOut to be redirected to logout page by default", async () => {
@@ -25,4 +28,10 @@ describe("user-logout", () => {
       redirectTo: SESSION_TIMEOUT_ROUTE,
     });
   });
+
+  it("should setSignOutFlagCookie to prevent race condition with concurrent getSession calls", async() => {
+    await userLogout(true);
+
+    expect(setSignOutFlagCookie).toHaveBeenCalled();
+  });
 });

src/utils/auth/user-logout.ts

@@ -3,8 +3,10 @@
 import { SESSION_LOGOUT_ROUTE } from "@src/app/session-logout/constants";
 import { SESSION_TIMEOUT_ROUTE } from "@src/app/session-timeout/constants";
 import { signOut } from "next-auth/react";
+import setSignOutFlagCookie from "@src/utils/auth/setSignOutFlagCookie";
 
 const userLogout = async (reasonTimeout: boolean = false) => {
+  await setSignOutFlagCookie();
   await signOut({
     redirect: true,
     redirectTo: reasonTimeout ? SESSION_TIMEOUT_ROUTE : SESSION_LOGOUT_ROUTE,

src/utils/constants.ts

@@ -27,3 +27,4 @@ export const PageviewTypeUrls: Record<ClientSidePageviewTypes, string> = {
 };
 
 export const SESSION_ID_COOKIE_NAME = "__Host-Http-session-id";
+export const SIGNOUT_FLAG_COOKIE_NAME = "__Secure-signout";